Preparation

Make shells:
Cut butter into 1/2-inch pieces. In a food processor combine flour, pecans, sugar, and salt and pulse until finely ground. Add butter and pulse until mixture resembles coarse meal. Add milk and pulse until a dough just forms. Form dough into a flattened disk and chill, wrapped in plastic wrap, at least 1 hour and up to 1 day.

Press dough (about 1/3 cup for each shell) onto bottoms and up sides of eight 4 1/2-inch fluted tart pans with removable rims. Prick bottoms of shells all over with a fork. Freeze shells 1 hour.

Preheat oven to 350°F.

Arrange shells in a shallow baking pan and bake in middle of oven 18 minutes, or until golden. Cool shells in pans on a rack. Shells may be made 1 day ahead and kept, covered, at room temperature.

Make filling:
In a heavy saucepan combine butter, 3/4 cup sugar, and lemon juice over moderately high heat, stirring occasionally until butter is melted. Bring mixture to a boil, stirring, and remove pan from heat. In a bowl whisk together whole eggs, yolks, and remaining 3/4 cup sugar until thick and pale. Add hot butter mixture in a stream, whisking constantly, and transfer to pan. Cook mixture over moderate heat, stirring constantly, until thick and just beginning to boil. Pour mixture through a fine sieve into a heatproof bowl and stir in zest. Cool lemon mixture completely, its surface covered with buttered wax paper, and chill at least 8 hours and up to 1 day.

In another bowl with an electric mixer beat together mascarpone and cream until thick and smooth. Fold in 1 1/2 cups lemon mixture, reserving remainder for another use, until combined well.

Make sauce:
In a blender puree sauce ingredients and pour through a fine sieve into a bowl, pressing on solids.

Sprinkle about 1 tablespoon superfine sugar evenly over each tart and caramelize with a blowtorch, moving flame evenly back and forth over sugar (not crust) until melted and caramelized, about 30 seconds. (Alternatively, caramelize sugar under a preheated broiler. If using broiler, cover crusts with pieces of foil to prevent burning.)

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Recent Review

A crowd pleaser. I would reduce the sugar in the future. I used a large tart pan instead of the individual ones, which made it difficult to cut into because the filling is creamy after the sugar on top is burned. Still it was a lovely, tasty dessert.